Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['F', 'y', '5851', 'A', '757', '7149', 'D', '395', 'F']

6, 25, 5851, 1, 757, 7149, 4, 395, 6